Hirth, K. (1911). Die deutsche Zementindustrie.
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Dyfyniad Arddull Chicago
Hirth, Karl. Die Deutsche Zementindustrie. Leipzig, 1911.
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Dyfyniad MLA
Hirth, Karl. Die Deutsche Zementindustrie. 1911.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.